enterAsTab = function(f, a) {
    addEvent(f, "keyup", function(e) {
        var l, i, f, j, o = e.target;
        if (e.key != 13 && (o.type == "text")) {
            //e.target.value = e.target.value.toUpperCase();
        }
    });

    addEvent(f, "keypress", function(e) {
        var l, i, f, j, o = e.target;
        if (e.key == 13 && o.type != "textarea" && o.type != "submit" && (a || !/button/i.test(o.type))) {
            for (i = l = (f = o.form.elements).length; f[--i] != o; )
                ;
            for (j = i; (j = (j + 1) % l) != i && (!f[j].type || f[j].disabled || f[j].readOnly || f[j].type.toLowerCase() == "hidden"); )
                ;
            e.preventDefault(), j != i && f[j].focus();
        }
    });
};

addEvent = function(o, e, f, s) {

    var r = o[r = "_" + (e = "on" + e)] = o[r] || (o[e] ? [[o[e], o]] : []), a, c, d;
    r[r.length] = [f, s || o], o[e] = function(e) {
        try {
            /*if(e.keyCode == 8) {
             return true;
             }*/
            (e = e || event).preventDefault || (e.preventDefault = function() {
                e.returnValue = false;
            });
            e.stopPropagation || (e.stopPropagation = function() {
                e.cancelBubble = true;
            });
            e.target || (e.target = e.srcElement || null);
            e.key = (e.which + 1 || e.keyCode + 1) - 1 || 0;
        } catch (f) {
        }
        for (d = 1, f = r.length; f; r[--f] && (a = r[f][0], o = r[f][1], a.call ? c = a.call(o, e) : (o._ = a, c = o._(e), o._ = null), d &= c !== false))
            ;
        return e = null, !!d;
    }
};

removeEvent = function(o, e, f, s) {
    for (var i = (e = o["_on" + e] || []).length; i; )
        if (e[--i] && e[i][0] == f && (s || o) == e[i][1])
            return delete e[i];
    return false;
};